Screw-cutting die.



J. P. LINEHAN. SCREW CUTTING DIE. APPLICATION FILED JULY 12, 1913.

Patented Feb. 24, 1914.

- Wi messes:

Inventor, Jo 1, mdz l/flwk Al'farngy hn F Lineh an,

- a resident of Yonkers,

. and transverse ways i rmrr" 5E1) STATES PATENT OFFICE.

JOHN EJQINEHAN, or YONKERS, imw YonK, 'nssreuon T0 :0. SAUNDERS A conr'omrron OF NEW YORK.

YONKERS, NEW' YORK,

' soas'w-cnrrme nrn.

teacher.

Specification or Letters tea-tent. pm t g4, Application filed July 12, rate. Serial no. 773,782.

To all whom it may concern Bedt known that l, JOHN F. Lrnnrmn, a citizen of the United States of America, and county of Westches ter, and State of New York, have invented certain new and useful improvements in Screw-Gutting Dies, of which the following is a specification.

This invention relates to means for automatically releasing screw-cutting dies which are constructed with screw-cutting jaws or chasers which may be separated to release the work and more particularly to a type of die which is on the market for the threading and reaming of the ends of pipe.

The object of the invention is to provide a releasing device which can be applied to dies of this general or specific type without interference with any of the existing features.

A further object is to provide a construction wherein the pressure of the end of the pipe against the reamer operates the release.

In the accompanying sheet of drawings which forms a part otthis application Figure 1 is a side elevation of a die embodying my invention. Fig. 2 is a front elevation of the die with the cover broken away. Fig. 3 is a section through the die on the line TIL-HI of Fig. 2.

The die comprises a supporting platel with a radially slotted hub 2 on one side 3 3 on the other side. The plate is in two parts for convenience of construction,, one part carrying the hub and the other part carrying the ways. The slots in the hub carry screw-cutting jaws or chasers 4 4:. Surrounding the hub is a shell v5 which. carries eccentric cam grooves 6 6 and bontiguous recesses 7 7 the walls of which are parallel to the cam grooves. The jaws or chasers abut against thefwalls of the recesses and have hooks 8 8 at their rear ends which engage the cam grooves. A handle 9 attached to the shell serves to impart a circular movement whichthrough the cams advances the screw-cutting jaws. A stop screw 10 carried by the supporting plate limits the movement. This screw is set back as the jaws wear so that they can be closed the necessary amount to kee the thread the same size. Friction bloc rs 11 11 serve to hold the die'in any desired adjustment when the automatic devices hereinafter described are not used.

latch will engage sons, or

In the center of the die is a reamer 12 which serves to cut out any burs and ream the inside of the end of the pipe at the same time that it is threaded. The reamer has a shoulder 13 and a square shank 14: which passes through a square hole in the supporting plate to keep it from turning, but the shoulder does not bear against the plate, instead it is supported from a block 1-5 which 1S let into a slot planed out between the ways. A. screw 16 at the middle of this block supports the reamer. The block in turn is supported in the slot by springs 17 17. To one end of this block is clamped by a screw 18 one end of a curved strip 19 which carries at its other end a hole 20. This hole is engaged by a spring protruded latch pin 21 the pin being carried by a block 22 which is bolted to the shell. The latch pin and the curved strip form the two latch members and the curved strip is of such length as will permit the location oi" the latch on the side of the die where it will be out of the way of and admit of the necessary adjustments. A spring 23 abuts against the block attached to the shell and an adjustable abutment 245 which is held to the supporting plate by a screw 25 supports the other end of the sprmg.

lln operation the die is supported on a transverse slide of a pipe cutting machine. The die is closed by pulling over the handle to a point where the jaws will be closed sufficiently to cut the required diameter of thread, and to preserve thesize when determined the stop screw is set up and the slotted latch member adjusted so that the as the socket of the handle strikes the stop. As the pipe is drawn into the die and the threading nears completion, the end of the pipe strikes the shoulder of the reamer and this through the connecting parts depresses one of the latch members and releases the shell which is then thrown around by the spring to open the jaws.

What I claim as new, and desire to secure by Letters Patent of the United States,is-

1. The combination of a supporting plate, screw-cutting jaws carried thereby, a circularly moving shell for closing the jaws, a latch for the shell when in position for closing the jaws, a shouldered reamer with connections to the latch whereby the latch is released when the reamer is depressed, and

the friction blocks aws are retracted leased, substantially verse ways by which it cutting jaws carried by larly moving shell for latch for the shell when mg the jaws, comprisin when the latch is meas described. 2. The combination of a plate with trans: is supported, screwthe plates, 2. circuclosing thejaws, a in position for closg an engaged and an engaging member, a. spring supported block guided between the transverse vways and carrying one of the latch members, a shoul-' dered reamer connected with the block whereby the block is depressed and the latch released, and means for returning the shell 15 whereby the jaws are retracted when the latch is released, substantially as described. Signed at Yonkers, N. Y., this 10th day of July, 1913.

JOHN F. LINEHAN.

WVitnesses:

WILLIAM B. FINK, PERLEY C. FINK. 

